Well I went to the web site of the tape unit and pulled out the manual.
It didnt really have any further explanation.
It says that it either means,
Hardware fault but this is when it is flashing rapidly, and it is not, Plus it seems to do a fine backup.
or you have inserted a prerecorded audio cartrage, (I dont know what that is perhaps if you want it as an aswering machine on)
No other answers.
Again the symptoms are flashing yellow light slowly and if you leave it long enought it goes away. Eg weekend or xmas.
According to the manual this drive is one of the following,
Seagate Data Drive dds,dds-dc,dds-2 and dds-3 tape drives
If no one response I suppose you can consider this issue closed as it looks like no one has any answers for me.
Regards